\section{Conclusions}
In a WiNoC the transceivers of the radio hubs account for a
significant fraction of the total communication energy budget.
Several work in literature in the context of low power WiNoC
architectures, do not take into account the impact of the antenna
directivity on power metrics. In addition, they assume that antennas
present an omnidirectional radiation pattern which is far away from
the reality (see, for instance, Fig.~\ref{fig:rad_patterns}). In this
paper we have highlighted the need for antennas orientation design
space exploration for improving the energy figures of WiNoC
architectures. We have considered three main scenarios, namely,
application specific (AS), general purpose (GP), and worst case
(WC). In the AS scenario, communication information are exploited for
optimizing the orientation of the antennas in such a way to maximize
the overlap of the radiation patterns of the antennas which
communicate more. The GP scenario, is derived from AS by assuming that
all the radio hubs communicate each other with the same
probability. Finally, the WC scenario is when the transceiver does not
implement any transmitting power on-line calibration scheme and,
therefore, all the radio hubs communicate using the same transmitting
power irrespective of their location in the chip. A state of the art
small-world based WiNoC architecture has been used as reference WiNoC
architecture in the experiments. The exploration of the antennas
orientation design space under different traffic patterns resulted in
important energy savings in all the three scenarios considered.
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